<template>
    <div class="xtx-dialog" v-show="visible" :class="{fade}">
      <div class="wrapper" :class="{fade}">
        <div class="header">
          <h3>{{ title }}</h3>
          <a href="JavaScript:;" class="iconfont icon-close-new" @click="closeDialog()"></a>
        </div>
        <div class="body">
          <slot/>
        </div>
        <div class="footer">
          <slot name="footer"/>
        </div>
      </div>
    </div>
  </template>
  <script>
import { ref, onMounted, watch } from 'vue'
  export default {
    name: 'XtxDialog',
    props: {
        title: {type: String, default: ''},
        // 数据双向绑定
        visible: {type: Boolean, default: false}
    },
    setup (props, {emit}) {
      const fade = ref(false)
      onMounted(() => {
        // 结构和样式同时加上无过度效果，需要些延时。
        setTimeout(() => {
          fade.value = true
        }, 0)
      })

    //   监听数据变化
    watch(() =>props.visible, (newValue) =>{
        setTimeout(() => {
        fade.value = newValue
      }, 0)
    }, {immediate: true})


    //点击x通知父组件改值
    const closeDialog = () => {
        emit('update:visible', false)
    }

      return { fade , closeDialog}
    }
  }
  </script>
  <style scoped lang="less">
  .xtx-dialog {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 8887;
    background: rgba(0,0,0,0);
    &.fade {
      transition: all 0.4s;
      background: rgba(0,0,0,.5);
    }
    .wrapper {
      width: 600px;
      background: #fff;
      border-radius: 4px;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%,-60%);
      opacity: 0;
      &.fade {
        transition: all 0.4s;
        transform: translate(-50%,-50%);
        opacity: 1;
      }
      .body {
        padding: 20px 40px;
        font-size: 16px;
        .icon-warning {
          color: @priceColor;
          margin-right: 3px;
          font-size: 16px;
        }
      }
      .footer {
        text-align: center;
        padding: 10px 0 30px 0;
      }
      .header {
        position: relative;
        height: 70px;
        line-height: 70px;
        padding: 0 20px;
        border-bottom: 1px solid #f5f5f5;
        h3 {
          font-weight: normal;
          font-size: 18px;
        }
        a {
          position: absolute;
          right: 25px;
          top: 25px;
          font-size: 24px;
          width: 20px;
          height: 20px;
          line-height: 20px;
          text-align: center;
          color: #999;
          &:hover {
            color: #666;
          }
        }
      }
    }
  }
  </style>